CY7C194 Datasheet, PDF (1/12 Pages) Cypress Semiconductor – 64K x 4 Static RAM

96
CY7C194
CY7C195
CY7C196
64K x 4 Static RAM
Features
• High speed
— 12 ns
• Output enable (OE) feature (7C195 and 7C196)
• CMOS for optimum speed/power
• Low active power
— 880 mW
• Low standby power
— 220 mW
• TTL-compatible inputs and outputs
• Automatic power-down when deselected
Functional Description
The CY7C194, CY7C195, and CY7C196 are high-perfor-
mance CMOS static RAMs organized as 65,536 by 4 bits.
Easy memory expansion is provided by active LOW Chip En-
able(s) (CE on the CY7C194 and CY7C195, CE₁, CE₂ on the
CY7C196) and three-state drivers. They have an automatic
power-down feature, reducing the power consumption by 75%
when deselected.
Writing to the device is accomplished when the Chip Enable(s)
(CE on the CY7C194 and CY7C195, CE₁, CE₂ on the
CY7C196) and Write Enable (WE) inputs are both LOW. Data
on the four input pins (I/O₀ through I/O₃) is written into the
memory location, specified on the address pins (A₀ through
A₁₅).
Reading the device is accomplished by taking the Chip En-
able(s) (CE on the CY7C194 and CY7C195, CE₁, CE₂ on the
CY7C196) LOW, while Write Enable (WE) remains HIGH. Un-
der these conditions the contents of the memory location
specified on the address pins will appear on the four data I/O
pins.
A die coat is used to ensure alpha immunity.
Logic Block Diagram
INPUT BUFFER
A₁
A₂
A₃
A₄
A₅
AA₆₇
1024 x 64 x 4
ARRAY
A₈
A₉
A₁₀
Pin Configurations
DIP/SOJ
Top View
DIP/SOJ
Top View
A₆ 1
24 VCC
NC 1
28 VCC
A₇ 2
23 A5
A_{6 2}
27 A₅
A₈ 3
A₉ 4
22 A₄
21 A₃
A₇ 3
A_{8 4}
26 A₄
25 A₃
A_{10 5}
20 A₂
A_{9 5}
24 _A2
A_{11 6} 7C194 19 A₁
A_{12 7}
18 A₀
A_{13 8}
17 I/O₃
A_{14 9}
16 I/O2
A₁₀
A₁₁
6
7
7C195
7C196
23
22
A₁
A₀
A_{12 8}
21 NC
A_{13 9}
20
CE₂
(7C196)
A₁₅ 10
CE 11
15 I/O1
14 I/O0
A₁₄ 10
A₁₅ 11
19 I/O₃
18 I/O₂
NC
(7C195)
I/O₃
GND 12
13 WE
CE₁ 12
17 I/O₁
OE 13
16 I/O₀
I/O₂
C194-2
GND 14
15 WE
C194-3
I/O₁
I/O₀
COLUMN
DECODER
POWER
DOWN
CE₂ (7C196 only)
CE₁
WE
(OE)
(7C195 and
7C196 ONLY)
C194-1
Selection Guide
Maximum Access Time (ns)
Maximum Operating Current (mA)
Maximum Standby Current (mA)
7C194-12
7C195-12
7C196-12
12
155
30
7C194-15
7C195-15
7C196-15
15
145
30
7C194-20
7C195-20
7C196-20
20
135
30
7C194-25
7C195-25
7C196-25
25
115
30
7C194-35
7C195-35
7C196-35
35
115
30
7C194-45
7C196-45
45
30
Cypress Semiconductor Corporation • 3901 North First Street • San Jose • CA 95134 • 408-943-2600
Document #: 38-05162 Rev. **
Revised September 18, 2001